Very casual and friendly. I also interviewed with the CEO and President of the company, which doesn't always happen. The interview started with a 1:1 with the hiring executive off site, again, very casual and what was to be an hour meeting quickly became almost 2 hours. I then was brought into the office for another meeting with the hiring manager and a chance to meet the entire team. It's not often that the founder and President of the company has the availability to come in and sit with a prospective employee during the hiring process.